android - 警报管理器不显示通知 api 26

Question

在 api 25 之前在诗句中完美运行。 我是 android 的新手，正在使用 Notification Alarm Manager 来显示通知。

谁能帮我看看有什么错误吗？

主要 Activity :

package br.exemploalarmmanagerbn;

import java.util.Calendar;

import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        boolean alarmeAtivo = (PendingIntent.getBroadcast(this, 0, new Intent("ALARME_DISPARADO"), PendingIntent.FLAG_NO_CREATE) == null);
        
        if(alarmeAtivo){
            Log.i("Script", "Novo alarme");
            
            Intent intent = new Intent("ALARME_DISPARADO");
            PendingIntent p = PendingIntent.getBroadcast(this, 0, intent, 0);
            
            Calendar c = Calendar.getInstance();
            c.setTimeInMillis(System.currentTimeMillis());
            c.add(Calendar.SECOND, 3);
            
            AlarmManager alarme = (AlarmManager) getSystemService(ALARM_SERVICE);
            alarme.setRepeating(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(), 5000, p);
        }
        else{
            Log.i("Script", "Alarme já ativo");
        }
    }
    
    @Override
    public void onDestroy(){
        super.onDestroy();
        
        /*Intent intent = new Intent("ALARME_DISPARADO");
        PendingIntent p = PendingIntent.getBroadcast(this, 0, intent, 0);
        
        AlarmManager alarme = (AlarmManager) getSystemService(ALARM_SERVICE);
        alarme.cancel(p);*/
    }
} 

广播接收辅助

package br.exemploalarmmanagerbn;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.graphics.BitmapFactory;
import android.media.Ringtone;
import android.media.RingtoneManager;
import android.net.Uri;
import android.support.v4.app.NotificationCompat;
import android.util.Log;

public class BroadcastReceiverAux extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        
        Log.i("Script", "-> Alarme");
        
        gerarNotificacao(context, new Intent(context, MainActivity.class), "Nova mensagem", "Título", "Descrição nova mensagem");
    }
    
    
    public void gerarNotificacao(Context context, Intent intent, CharSequence ticker, CharSequence titulo, CharSequence descricao){

if (Build.VERSION.SDK_INT >= 26) {
            if (nm.getNotificationChannel(CHANNEL_ID) == null) {
                nm.createNotificationChannel(new NotificationChannel(CHANNEL_ID, CHANNEL_NAME,
                        NotificationManager.IMPORTANCE_DEFAULT));
            }
        }

        NotificationManager nm = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        PendingIntent p = PendingIntent.getActivity(context, 0, intent, 0);
        
        NotificationCompat.Builder builder = new NotificationCompat.Builder(context);
        builder.setTicker(ticker);
        builder.setContentTitle(titulo);
        builder.setContentText(descricao);
        builder.setSmallIcon(R.drawable.ic_launcher);
        builder.setLargeIcon(BitmapFactory.decodeResource(context.getResources(), R.drawable.ic_launcher));
        builder.setContentIntent(p);
        
        Notification n = builder.build();
        n.vibrate = new long[]{150, 300, 150, 600};
        n.flags = Notification.FLAG_AUTO_CANCEL;
        nm.notify(R.drawable.ic_launcher, n);
        
        try{
            Uri som = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
            Ringtone toque = RingtoneManager.getRingtone(context, som);
            toque.play();
        }
        catch(Exception e){}
    }
}

list

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="br.exemploalarmmanagerbn"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />
    <uses-permission android:name="android.permission.VIBRATE"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="br.exemploalarmmanagerbn.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <receiver android:name="BroadcastReceiverAux" android:label="BroadcastReceiverAux">
            <intent-filter>
                <action android:name="ALARME_DISPARADO"/>
                <category android:name="android.intent.category.DEFAULT"/>
            </intent-filter>
        </receiver>
    </application>

</manifest>

Answer 1

您必须先创建通知 channel ，然后使用该 channel 发布通知

NotificationManager mNotificationManager =
        (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
// The id of the channel.
String id = "my_channel_01";
// The user-visible name of the channel.
CharSequence name = getString(R.string.channel_name);
// The user-visible description of the channel.
String description = getString(R.string.channel_description);
int importance = NotificationManager.IMPORTANCE_HIGH;
NotificationChannel mChannel = new NotificationChannel(id, name, importance);
// Configure the notification channel.
mChannel.setDescription(description);
mChannel.enableLights(true);
// Sets the notification light color for notifications posted to this
// channel, if the device supports this feature.
mChannel.setLightColor(Color.RED);
mChannel.enableVibration(true);
mChannel.setVibrationPattern(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400});
mNotificationManager.createNotificationChannel(mChannel);


// The id of the channel.
String CHANNEL_ID = "my_channel_01";
NotificationCompat.Builder mBuilder =
        new NotificationCompat.Builder(this, CHANNEL_ID)
            .setSmallIcon(R.drawable.notification_icon)
            .setContentTitle("My notification")
            .setContentText("Hello World!");